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How to Use the Car's Internal and External Air Circulation?

2 Answers

DeArthur

07/28/25 9:24pm

Methods for using the car's internal and external air circulation are: 1. Use internal circulation during traffic jams and external circulation during high-speed driving; 2. The use of internal and external circulation should be combined with air conditioning and heating; 3. Use external circulation during long-distance driving to allow fresh air from outside to enter the cabin, avoiding low oxygen levels inside; 4. When the temperature is high, turn off the fan and open the external circulation to maintain the interior temperature while getting fresh air; 5. Set the air conditioning to internal circulation mode in summer; 6. Use internal circulation when driving in the city; 7. Close the external circulation to block outside airflow when encountering dusty road sections.

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Cavalcanti

08/12/25 2:03am

I've been driving for over a decade and have developed a habit of adjusting the air recirculation right after starting the engine. Specifically, there's a button in the air conditioning control area, usually labeled "Recirculation" or with a small car icon featuring an arrow turning inside. Pressing it activates the recirculation mode, which cycles only the air inside the car, preventing external dust or exhaust fumes from entering—this is particularly useful during city traffic jams or when passing through tunnels. Leaving it unpressed means the system is in fresh air mode, drawing in outside air to maintain ventilation. I prefer using recirculation mode when first turning on the AC in summer to cool down the cabin quickly, then switching to fresh air mode to prevent stuffiness. In winter, I start with fresh air mode when using the heater to avoid fogging up the windows. If you have an automatic climate control system, it will switch modes based on sensor readings, but manual control offers more flexibility. The key is to adjust according to road conditions: use fresh air mode on highways and recirculation in polluted areas. Don’t forget to check the cabin air filter every six months—excessive dust can impede airflow. Overall, it’s quite simple and becomes second nature once you make it a habit.

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